Check the cam and crank position sensors. As well as the connections near your fuse box. M I'm ne did the same and it was a bad sensor. Cam is on passenger side on the valve cover near the power steering pump. Branks sensor is directly below near bottom and next to harmonic balancer

After a year and two motors I sent my 626 ton the junkyard. Loved the car for the first month. Then the first engine went. Since then and 4 grand I had the car less then a year and bittersweet to send it off. But I gained alot of knowledge by working on it constantly. As well as surplus parts. So i figure I can atleast offer some know how here while I recoup what I can to go towards my next project.